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Finding the Fourth Proportional to 711,059.32, 981,263.64 and 388,790.20

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Solution

The fourth proportional to 711,059.32, 981,263.64 and 388,790.20 is: 536,531.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,059.32 : 981,263.64 = 388,790.20 : x
  2. Step 2: Convert to fraction form
    711,059.32/981,263.64 = 388,790.20/x
  3. Step 3: Cross multiply
    711,059.32x = 981,263.64 × 388,790.20
  4. Step 4: Simplify right side
    711,059.32x = 381,505,686,848.33
  5. Step 5: Solve for x
    x = 381,505,686,848.33/711,059.32
  6. Step 6: Final answer
    x = 536,531.45

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.